console.log('hello lib.js')
exports.hello = 'world';


exports.add = function (a, b) {
    return a + b;
}

exports.geekbang = {
    hello: 'world'
}

module.exports = function minus(a, b) {
    return a - b;
}

setTimeout(() => {
    console.log(exports)
}, 200)
